Parts Gurus - Need help identifying part so I can order

[copper]

I'll be dropping the engine and replacing the clutch, and most of the seals, washers and gaskets.

I have a small bit of oil on the topside and it's in the area of the oil breather, thermostat, and pressure sending unit.

I have the breather gasket and will order the thermostat o-ring, but I don't know what I need in regards to the pressure sending unit. When I pull the parts list up, I get two matches. One is $70 and the other is $9. And I can't see any washers or seals associated to it.

My pressure gauge works. Do I need to replace the whole sending unit, or is there a washer I can replace to ensure there's no leakage? The unit itself is probably 16 years old.

Here's a quick picture. The pressure sending unit (correct me if I have this wrong please) is what I am having difficulty with finding the proper parts match for.

Which one is this?
Oil Pressure Warning Switch, 911 (1969-73) C-606-230-00 $9.20

or

Oil Pressure Sender 911 (1965-73), Each A-741-551-01 $70.90

My Haynes service manual refers to it as the sending unit, but it looks nothing like the silver sender with black plastic knob pictured on the second item. The warning switch looks like a match according to the black and white diagram on the parts list.

I'm confused...



Thanks a bunch

Jim

[David]

The pressure sender is # 901 741 551 01.
It doesn't show in the PET pic but it appears the seal under the sender is N 013 808 9 the size is 10 x 16. There's also a seal under the part that the sender threads into which is 900 123 044 30 which is 18 x 22.

[copper]

Still looking for a definitive answer so I can order...

Wayne? Noah?

(Wayne, I had emailed you about this but I know you get a ton of emails)

The round yellowed looking part in the picture looks nothing like the silver sending unit on Pelican, however the parts diagram matches the photo for the warning switch. So which is it?

What is the seal for this unit? Do I NEED to replace this unit just due to the time it's been in there? Or can I just replace the seals/washers, or snug it up...

Jim

[copper]

bump

[Early_S_Man]

Jim,

The answer depends on whether you have the 'standard' 911T instruments which only had a warning light for oil pressure ... or the 'S' gauge package that included the oil pressure gauge.

If you only have the warning light, get the switch ...

If you have the gauge, get the pressure sender!

[pjv911]

The one in your picture is a sender .


Kurt Williams

[copper]

I have a pressure light and a guage.

The guage has always appeared to work fine, and fluctuates as normal during varying driving conditions.

So, is this something I need to change, or is there a seal I can buy to replace, while I'm doing the breather gasket and thermostat 0-ring?

Jim

[pjv911]

Since its easy to change (your running carbs) you can leave it alone . If its leaking there is no way to fix it . You must replace it . BTW be sure to lubricate the thermostat oring well . Also go easy and use a spread pattern when tightening the breather cover . Dont paint it either . The paint will cause a leak over time .

Kurt Williams

[Crachian]

Jim, chances are the leak you have is not one of the aluminum sealing rings; it is most likely the sender where the large cylindrical part is crimped onto the base. These leak.

Since your sender is working, you may try cleaning it really well and trying to stall the leaking by putting epoxy around the crimped edge. You may get lucky and this will do it. If not, oh well, $70 please.

If you order all new sealing rings, do yourself a favor and order half a dozen of each size. These are strangely impossible to find except through places like Pelican or maybe the dealer.